scholarly journals Experimental Investigations on Subsequent Yield Surface of Pure Copper by Single-Sample and Multi-Sample Methods under Various Pre-Deformation

Materials ◽  
2018 ◽  
Vol 11 (2) ◽  
pp. 277 ◽  
Author(s):  
Gui-Long Liu ◽  
Shi-Hong Huang ◽  
Che-Si Shi ◽  
Bin Zeng ◽  
Ke-Shi Zhang ◽  
...  
Keyword(s):  
Yield Surface ◽  
Pure Copper ◽  
Single Sample ◽  
Experimental Investigations ◽  
Subsequent Yield Surface

scholarly journals A Numerical Strategy to Identify the FSW Process Optimal Parameters of a Butt-Welded Joint of Quasi-Pure Copper Plates: Modelling and Experimental Validation

2021 ◽  
Author(s):  
Monica Daniela IORDACHE ◽  
Claudiu BADULESCU ◽  
Malick DIAKHATE ◽  
Adrian CONSTANTIN ◽  
Eduard Laurentiu NITU ◽  
...  
Keyword(s):  
Welded Joint ◽  
Pure Copper ◽  
Correlation Method ◽  
Image Correlation ◽  
Experimental Investigations ◽  
Optimal Parameters ◽  
Friction Stir ◽  
Mass Scaling ◽  
Surface Response ◽  
Fsw Parameters

Abstract Determining the optimal parameters of the Friction Stir Welding (FSW) process, which are suitable for a given joint configuration, remains a great challenge and is often achieved through extremely time-consuming and costly experimental investigations. The present paper aims to propose a strategy for the identification of the optimal parameters for a butt-welded joint of 3-mm thick quasi-pure copper plates. This strategy is based on FEM (finite elements method) simulations and the optimal temperature that is supposedly known. A robust and efficient finite element model that is based on the Coupled Eulerian-Lagrangian (CEL) approach has been adopted and a temperature-dependent friction coefficient has been used. Besides, the mass scaling technique has been used to significantly reduce the simulation time. The thermo-mechanical behavior of the butt-welded joint was modeled using a Johnson-Cook plasticity model that was identified through lab tests at different temperatures. The results of the parametric study help to define the numerical surface response, and based on this latter one can found the optimal parameters, advancing (υa) and rotational (υr) speeds, of the FSW process. This numerical surface response has been validated with good agreement between the numerical prediction of the model and the experimental results. Furthermore, experimental investigations involving x-ray radiography, digital image correlation method, and fracture surface analysis have helped a better understanding of the effects of FSW parameters on the welded joint quality.

A study on subsequent yield surface based on the distributed-element model

2002 ◽  
Vol 18 (1) ◽  
pp. 51-70 ◽  
Author(s):  
Dar-Yun Chiang ◽  
Kai-Hong Su ◽  
Ching-Hsing Liao
Keyword(s):  
Yield Surface ◽  
Element Model ◽  
Subsequent Yield Surface

Plastic Stress-Strain Relationships—Some Experiments to Derive a Subsequent Yield Surface

1964 ◽  
Vol 31 (4) ◽  
pp. 676-682 ◽  
Author(s):  
John Parker ◽  
M. B. Bassett
Keyword(s):  
Yield Surface ◽  
Yield Function ◽  
Loading Paths ◽  
Transverse Tension ◽  
Initial Loading ◽  
Degree Of Anisotropy ◽  
Subsequent Yield Surface ◽  
Definition Of ◽  
Radial Loading ◽  
Tubular Specimens

Experiments have been carried out on thin tubular specimens of alpha brass subjected to various combinations of torque and transverse tension, after initial overstrain in torsion. The loading paths were based upon a yield function expressing one degree of anisotropy which had been found previously to give good correlation of initial radial loading paths. The primary definition of yield used was the “Taylor-Quinney, Lode”; however, “Limit of Proportionality” and “Initial Loading Slope Tangent” definitions have also been investigated. The derived yield surface (Taylor-Quinney) shows strong positive cross effect, rotation, and a Bauschinger effect extending over the whole reversed quadrant to initial loading. No indication of the formation of a corner on the yield surface was found.

Effects of Cold Working Under Pressure on Subsequent Yield

1972 ◽  
Vol 94 (3) ◽  
pp. 575-580 ◽  
Author(s):  
J. G. Hoeg ◽  
R. L. Davis
Keyword(s):  
Stainless Steel ◽  
Yield Surface ◽  
Cold Working ◽  
Axial Stress ◽  
Fluid Pressure ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Compression Tests ◽  
Subsequent Yield Surface ◽  
Longitudinal Strains

A method utilizing high pressure fluid environments is described whereby a three-dimensional subsequent yield surface was determined for 304 stainless steel. Cylindrical parent specimens of this material were prestrained in axial compression under fluid pressure and then small subspecimens were sectioned from these parent specimens. Finite element techniques were used to optimize the parent specimen size so that a zone of uniform axial stress would result during the prestraining. Longitudinal strains in this zone were monitored during the prestraining and the subspecimens were cut from this region in a manner that did not allow the machining to appreciably affect the properties of the specimens. Following this, conventional tension and compression tests were performed on the subspecimens in various fluid pressure environments to determine the yield strengths for the cold-worked material in the direction of the principal axis of prestrain and the two transverse axes. These data are used to construct the three-dimensional subsequent yield surface which clearly illustrates the effects on 304 stainless steel, of cold working under pressure.

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